From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Graph comparing friction in different types of cantilever springs under greased and rusty conditions.
| Identifier | ExFiles\Box 35\2\ scan 248 | |
| Date | 5th November 1920 | |
| FRICTION IN CANTILEVER SPRINGS ① THICK LEAF TYPE 6 LEAVES GREASED ② THICK LEAF TYPE 6 LEAVES RUSTY ③ THIN LEAF TYPE 11 LEAVES GREASED ④ THIN LEAF TYPE 11 LEAVES RUSTY BOTH TYPES OF SPRING ARE THE SAME STRENGTH Y-AXIS: FRICTION IN LBS (Scale: 25, 50, 75, 100, 125, 150, 175, 200, 225, 250) X-AXIS: LOAD IN LBS MEASURED AT END OF SPRING (Scale: 200, 400, 600, 800, 1000, 1200, 1400, 1600, 1800, 2000) 5/11/20 T-14 | ||